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2h ago

ISRO Passes Static Test for Redesigned PSLV Third Stage

Engineers will use the test data to verify nozzle, interface and sealing fixes and to plan further checks that must clear before PSLV flights resume.

A view of the ground static test of the PSLV third stage (PS3) successfully carried out at the Static Test Facility in Satish Dhawan Space Centre, in Sriharikota on November 12, 2026.

Overview

  • ISRO conducted a successful ground static firing of the modified PSLV third stage at Satish Dhawan Space Centre on Thursday and is now analysing detailed sensor and performance data.
  • The PS3 motor was reworked to strengthen the nozzle configuration, reinforce mechanical interfaces and add redundancy in sealing systems, and design margins were rechecked.
  • The redesign followed two consecutive third-stage failures that affected missions on May 18, 2025, when a chamber pressure drop ended PSLV-C61's mission, and on January 12, 2026, when PSLV-C62 saw roll-rate disturbances and a flight-path deviation.
  • ISRO has also tightened raw-material acceptance, assembly procedures and non-destructive testing during integration and transport, and it plans additional static and integrated-vehicle tests before deciding when to restart operational launches.
  • The PSLV has been India’s reliable workhorse for a wide range of science and commercial satellites, so proving the modified stage is central to restoring customer confidence and keeping ISRO’s upcoming mission schedule on track.